I can plot coordinates. Given the equation of a straight line, I can complete a table of values. From a table of values, I can draw a straight line. Given.

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Presentation on theme: "I can plot coordinates. Given the equation of a straight line, I can complete a table of values. From a table of values, I can draw a straight line. Given."— Presentation transcript:

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I can plot coordinates. Given the equation of a straight line, I can complete a table of values. From a table of values, I can draw a straight line. Given a set of data, I can plot points on a scatter graph. I can draw a line of best fit. S3 BLOCK 8 Straight Line

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Scatter graph Given a set of data, I can plot points on a scatter graph. I can draw a line of best fit.

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Scatter graphs Scatter graphs are used to represent and compare two sets of data. By looking at a scatter diagram it is possible to say whether there is any connection (correlation) between the two sets of data.

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Line of Best Fit When there is a correlation between sets of data on a scatter graph, it is possible to draw a line of best fit. When drawing a line of best fit the aim is to keep the distance of all the points from the line to a minimum. Sometimes it is helpful to try to keep the number of points above the line as the same as the number of points below the line.

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Example In a class 10 pupils tool a Science test and an Maths test. Their scores are listed in the table. (a)Illustrate this data with a scatter graph. (b)Draw a best fitting line on the graph PupilABCDEFGHIJ Maths Score2101549614191218 Science Score61218311814171020